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Impact of salt layers interaction on the salt flow kinematics and diapirism in the Eastern Persian Gulf, Iran: Constraints from seismic interpretation, sequential restoration, and physical modelling
Tectonophysics ( IF 2.7 ) Pub Date : 2021-04-23 , DOI: 10.1016/j.tecto.2021.228887
Jafar Hassanpour , Josep Anton Muñoz , Ali Yassaghi , Oriol Ferrer , Salman Jahani , Pablo Santolaria , Seyed Mohsen SeyedAli

Interpretation of reflection seismic profiles, sequential restoration, and physical modelling are presented to understand the kinematics of salt flow and diapirism in the Eastern Persian Gulf, offshore Southern Iran. Salt tectonics in this area result from the overlapping Ediacaran–Early Cambrian Hormuz Salt, which is regionally present, and Oligocene–Early Miocene Fars Salt, which is locally developed. The Hormuz and Fars salts began flowing at Cambrian(?) and Early Miocene times, respectively. Diapirs fed by the Hormuz Salt rose passively during Palaeozoic and Mesozoic times and were rejuvenated by contractional deformation events in the Cenozoic. Fars-Salt structures exist either as salt walls and anticlines around those diapirs of Hormuz Salt that developed allochthonous salt bodies during a Palaeocene–Eocene contractional squeezing before deposition of the Fars Salt, or as gentle shallow salt pillows above deep pillows of Hormuz Salt, suggesting a kinematic linkage. Flow of Fars Salt was mainly triggered by differential sedimentary loading. It seems that its lateral flow kinematics was controlled by the behaviour of the underlying Hormuz-Salt sheets. More than ~10-km-long salt sheets were efficiently evacuated back towards the Hormuz-Salt diapir, and consequently, maintained the Fars-Salt evacuation and flow to the same direction, accompanied by welding of both salt layers. Conversely, smaller, less than ~3-km-long salt sheets allowed limited salt evacuation or rearrangement that was probably still sufficient to trigger Fars-Salt flow near the central (Hormuz-Salt) diapir. Fars-Salt evacuation was enhanced by differential sedimentary loading, resulting in incipient primary welds. Subsequently, the depocentres migrated towards the areas of available Fars Salt away from the central diapir. In both cases, layer-parallel shortening related to regional contraction probably played also a role in triggering the Fars-Salt flow at Early Miocene, but was more influential at later stages by squeezing the salt structures (Hormuz and Fars) since about Late Miocene onwards.



中文翻译:

盐层相互作用对伊朗东部波斯湾盐流运动学和二叠纪的影响:地震解释,顺序恢复和物理建模的约束

介绍了反射地震剖面的解释,顺序恢复和物理模型,以了解伊朗南部海域东部波斯湾的盐流和水成岩运动学。该地区的盐构造是由于重叠的Ediacaran-早寒武纪Hormuz盐(局部存在)和渐新世-早中新世Fars盐(局部发育)产生的。Hormuz和Fars盐分别在寒武纪和中新世早期开始流动。在古生代和中生代,由霍尔木兹海盐饲喂的虫被动上升,并因新生代的收缩变形事件而恢复活力。法尔斯-萨尔特结构存在于霍尔木兹盐的底壁周围,盐壁和背斜存在,在古波斯-始新世压缩挤压法尔斯盐之前,它们发育出了异质盐体,或者在霍尔木兹盐的深枕之上有温和的浅盐枕,这表明运动学联系。Fars盐的流动主要是由不同的沉积负荷触发的。似乎它的侧向运动学是由下面的Hormuz-Salt板的行为控制的。多于10公里长的盐层被有效地疏散回Hormuz-Salt底辟河,因此,保持了Fars-Salt的疏散和流向相同的方向,并伴随着两​​个盐层的焊接。相反,较小,小于3公里长的盐层允许有限的盐类疏散或重新排列,这可能仍足以触发法尔盐在中央底辟(Hormuz-Salt)附近的流动。不同的沉积物负荷促进了Fars-Salt疏散,从而导致了初期的初次焊接。随后,中心地带迁移到了可用的Fars Salt地区,远离了中央底辟。在这两种情况下,与区域收缩有关的平行层缩短可能在中新世早期触发了Fars-Salt流动中也起了作用,但自中新世晚期以来,通过挤压盐结构(Hormuz和Fars)在后期具有更大的影响力。 。

更新日期:2021-04-29
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